With 10.1, in a single machine site, the simplest configuration is to expose one GIS server through a web adapter on the same machine.
In this scenario:
§ Dekho is deployed under the one Tomcat on the same machine.
§ Add a connection to the ArcGIS Server using the Dekho Administrator, via default 6080 port.
§ Add map/image services to a Dekho Template via the web adapter (make a use connection to ArcGIS for Server, via the web adapter URL)